GO:0046873 metal ion transmembrane transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046873 metal ion transmembrane transporter activity enables the transfer of metal ions across a membrane [2,4].
• This activity is essential for maintaining metal ion homeostasis, including manganese, zinc, and nickel [1,2,4].
• Key transporters such as SLC30A10 and HupE use conserved transmembrane domains for metal recognition and transport [1,2,4].
• Dysfunction of metal ion transporters is linked to diseases like Parkinson's disease and hypertension [2,5].
• CRISPR knockout, point mutation, and knock-in models are powerful tools to dissect transporter function [2,4].
• EDITGENE provides comprehensive CRISPR services to study metal ion transmembrane transporter activity.
Description
Metal ion transmembrane transporter activity (GO:0046873) is a molecular function that enables the transfer of metal ions from one side of a membrane to the other [2,4]. This activity is fundamental to cellular physiology, as metal ions such as manganese, zinc, and nickel are essential cofactors for numerous enzymes and signaling molecules [1,2]. Researchers study this term to understand how cells maintain metal homeostasis and how disruptions lead to disease [2,4]. The QuickGO definition states that this activity enables the transfer of metal ions across a membrane, and it includes synonyms such as heavy metal-exporting ATPase activity and heavy metal ion porter activity. This article explores the mechanism, key genes, and research methods for studying GO:0046873, with a focus on real PubMed literature.
metal ion transmembrane transporter activity At A Glance
| GO ID | GO:0046873 |
|---|---|
| GO term | metal ion transmembrane transporter activity |
| Ontology | molecular_function |
| Synonym | heavy metal-exporting ATPase activity; heavy metal ion:hydrogen symporter activity; heavy metal ion porter activity; heavy metal ion transporter activity; high affinity metal ion uptake transporter activity; low affinity metal ion uptake transporter activity |
| Major function | Transfer of metal ions across membranes |
| Major transporters | SLC30A10, HupE, and other metal transporters [1,2,4] |
| Associated diseases | Parkinson's disease, hypertension [2,5] |
| Research methods | CRISPR knockout, point mutation, knock-in, overexpression [2,4] |
What Is GO:0046873?
In simple terms, metal ion transmembrane transporter activity is the ability of a protein to move metal ions across a cell membrane. This activity is defined by the Gene Ontology as enabling the transfer of metal ions from one side of a membrane to the other. It encompasses various transport mechanisms, including ATP-powered pumps, symporters, and channels, and is critical for processes such as metal detoxification, nutrient uptake, and signal transduction [2,4].
Why Is metal ion transmembrane transporter activity Important in Cell Biology?
Metal ion transmembrane transporter activity is crucial for maintaining cellular metal homeostasis, which is essential for proper enzyme function, signaling, and detoxification [2,4]. Dysregulation of these transporters can lead to a variety of diseases, including neurodegenerative disorders and cardiovascular diseases [2,5]. Understanding the molecular mechanisms of these transporters can provide insights into disease pathogenesis and potential therapeutic targets [2,4].
• Maintains cellular metal ion homeostasis [2,4].
• Essential for nutrient uptake and metal detoxification [1,2].
• Dysfunction linked to Parkinson's disease and hypertension [2,5].
• Target for therapeutic intervention in metal-related disorders [2,4].
• Key to understanding cellular signaling and enzyme function [1,4].
• Involved in bacterial metal transport and virulence.
• Provides insights into evolutionary conservation of transport mechanisms [1,4].
• Facilitates study of membrane protein structure and function [2,4].
What Happens During metal ion transmembrane transporter activity?
Substrate Recognition and Binding
In simple terms: The transporter first grabs the metal ion it needs to move.
Metal ion transporters possess specific binding sites within their transmembrane domains that recognize and bind metal ions such as manganese or nickel [1,2]. For example, the HupE Ni2+ transporter interacts with metal ions through its transmembrane region, which explains its transport efficiency. Similarly, SLC30A10 has a putative metal binding site in its transmembrane domain that is distinct from related zinc transporters.
Conformational Changes and Translocation
In simple terms: The transporter changes shape to push the metal ion across the membrane.
Upon metal ion binding, transporters undergo conformational changes that allow the ion to be translocated across the membrane [2,4]. Structural elements in both transmembrane and cytoplasmic domains of SLC30A10 are required for its manganese efflux activity. This process often involves alternating access mechanisms where the binding site is exposed to one side of the membrane at a time.
Energy Coupling and Regulation
In simple terms: Some transporters use energy to pump ions against their concentration gradient.
Metal ion transport can be driven by ATP hydrolysis, as seen in heavy metal-exporting ATPases, or by ion gradients, as in symporters [2,4]. The activity is tightly regulated to maintain metal homeostasis, and dysregulation can lead to disease [2,5]. For instance, myocardial cation transport is critical for cardiac function and is regulated by various signaling pathways.
Metal Ion Specificity and Selectivity
In simple terms: Transporters can distinguish between different metal ions.
Transporters exhibit selectivity for specific metal ions based on the coordination chemistry of their binding sites [1,4]. The putative metal binding site in SLC30A10 is different from that of related zinc transporters, allowing it to preferentially transport manganese. This specificity is crucial for avoiding toxicity and maintaining proper metal balance [1,4].
Key Genes Involved in GO:0046873 metal ion transmembrane transporter activity
The following genes encode proteins with metal ion transmembrane transporter activity, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC30A10 | Manganese efflux transporter | Mutations cause hypermanganesemia and Parkinsonism [2,4] |
| HupE | Nickel transporter in bacteria | Model for metal ion transport mechanism |
| ATP7A | Copper-transporting ATPase | Menkes disease |
| ATP7B | Copper-transporting ATPase | Wilson disease |
| SLC11A1 | Divalent metal transporter | Innate immunity |
| SLC39A1 | Zinc transporter | Zinc homeostasis |
| SLC30A1 | Zinc efflux transporter | Zinc homeostasis |
| TRPM7 | Magnesium transporter | Cell proliferation |
| SLC8A1 | Sodium/calcium exchanger | Cardiac function |
| ATP2B1 | Calcium-transporting ATPase | Hypertension |
| SLC9A1 | Sodium/hydrogen exchanger | Intracellular pH |
| SLC12A1 | Sodium-potassium-chloride cotransporter | Kidney function |
| SLC4A1 | Anion exchanger | Red blood cell function |
| SLC26A3 | Chloride/bicarbonate exchanger | Intestinal function |
| SLC5A1 | Sodium/glucose cotransporter | Glucose uptake [3,7] |
| SLC2A1 | Glucose transporter | Glucose homeostasis |
| SLC7A11 | Cystine/glutamate antiporter | Redox balance |
How Is metal ion transmembrane transporter activity Regulated?
Metal ion transmembrane transporter activity is regulated at multiple levels, including transcriptional control, post-translational modifications, and interaction with regulatory proteins [2,4]. For example, the activity of SLC30A10 is dependent on structural elements in its transmembrane and cytoplasmic domains, which may be subject to regulatory phosphorylation. Additionally, metal ion transport can be regulated by cellular metal levels, ensuring homeostasis. In myocardial cells, cation transport is regulated by hormonal and signaling pathways that influence cardiac function.
metal ion transmembrane transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC30A10 | Hypermanganesemia with dystonia, Parkinsonism | Knockout mouse, patient-derived iPSCs [2,4] |
| ATP7B | Wilson disease | Knockout mouse, hepatic cell lines |
| ATP7A | Menkes disease | Knockout mouse, fibroblast cells |
| SLC8A1 | Hypertension, cardiac arrhythmia | Knockout mouse, cardiomyocytes |
| SLC2A1 | GLUT1 deficiency syndrome | Knockout mouse, neuronal cells |
Neurodegeneration and Metal Transport Dysfunction
Dysfunction of metal ion transporters, such as SLC30A10, leads to manganese accumulation in the brain, causing Parkinsonism and neurodegeneration [2,4]. Mutations in SLC30A10 result in hypermanganesemia, highlighting the critical role of manganese efflux in neuronal health [2,4].
Cardiovascular Disease and Cation Transport
Alterations in myocardial cation transport contribute to hypertension and cardiac arrhythmias. For instance, dysregulation of sodium/calcium exchangers and calcium ATPases can affect cardiac contractility and blood pressure.
Metal Transport in Cancer and Metabolic Disorders
Altered metal ion transport is observed in cancer and metabolic diseases, where changes in zinc and manganese homeostasis affect cell proliferation and survival [4,6]. Targeting these transporters may offer therapeutic opportunities.
From metal ion transmembrane transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of SLC30A10 loss on manganese homeostasis? | Knockout mouse or cell line [2,4] |
| How do point mutations in SLC30A10 affect transport activity? | Point mutation knock-in cell lines [2,4] |
| Can overexpression of HupE enhance nickel uptake? | Overexpression in bacterial cells |
| What is the role of ATP7B in copper transport? | Knock-in of tagged ATP7B in hepatic cells |
| How does SLC8A1 contribute to cardiac function? | Cardiac-specific knockout mouse |
| What are the dynamics of metal ion transport in live cells? | Fluorescent metal sensors and live imaging |
How to Study the metal ion transmembrane transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss of transporter function | Studying gene essentiality [2,4] |
| Point mutation knock-in | Effect of specific mutations | Dissecting transport mechanism [2,4] |
| Overexpression | Gain of function | Enhancing metal uptake |
| Metal flux assays | Transport rate | Quantifying activity [2,4] |
| Fluorescent metal sensors | Intracellular metal levels | Live-cell imaging |
| RNA-seq | Gene expression changes | Identifying regulatory networks [2,4] |
| Proteomics | Protein interactions | Finding transport complexes [2,4] |
| Cryo-EM | 3D structure | Understanding transport mechanism [1,4] |
Genetic Approaches to Study Metal Transporters
CRISPR-Cas9 knockout, point mutation, and knock-in models are essential for dissecting the function of metal ion transporters [2,4]. These methods allow researchers to observe the effects of specific mutations on transport activity and metal homeostasis [2,4].
Biochemical and Structural Techniques
Biochemical assays, such as metal flux measurements and ATPase activity assays, are used to quantify transport activity [2,4]. Structural techniques like X-ray crystallography and cryo-EM provide insights into the molecular architecture of transporters [1,4].
Imaging and Live-Cell Analysis
Fluorescent metal sensors and live-cell imaging enable real-time monitoring of metal ion transport dynamics. These techniques are valuable for studying transporter localization and activity in physiological contexts.
Omics and Bioinformatics
Transcriptomics and proteomics can identify expression changes in metal transporters under different conditions [2,4]. Bioinformatics tools predict metal binding sites and transport mechanisms [1,4].
How CRISPR Can Be Used to Study GO:0046873 metal ion transmembrane transporter activity
Knockout
CRISPR knockout of metal transporter genes, such as SLC30A10, allows researchers to study the consequences of loss of function on metal homeostasis and cellular physiology [2,4]. This approach is valuable for validating the role of transporters in disease models [2,4].
Point Mutation
Introducing point mutations in transporter genes via CRISPR can mimic disease-associated mutations and reveal their impact on transport activity [2,4]. For example, mutations in the transmembrane domain of SLC30A10 affect manganese efflux [2,4].
Knock-in
Knock-in of tagged or reporter constructs enables visualization and tracking of transporters in live cells. This method is useful for studying transporter localization and dynamics.
Overexpression
CRISPR activation or cDNA overexpression can increase transporter levels to study gain of function and enhance metal uptake. Overexpression of HupE in bacteria enhances nickel transport.
How EDITGENE Supports metal ion transmembrane transporter activity Research
Researchers studying metal ion transmembrane transporter activity-related genes often need to determine whether a candidate gene is causally involved in metal homeostasis and disease. EDITGENE provides a comprehensive suite of CRISPR services to facilitate these investigations, from knockout to knock-in models.
Contact EDITGENE today to design your custom CRISPR model for metal ion transmembrane transporter activity research.
Frequently Asked Questions About metal ion transmembrane transporter activity
What is metal ion transmembrane transporter activity?
It is a molecular function that enables the transfer of metal ions across a membrane, as defined by GO:0046873 [2,4].
What genes are involved in metal ion transmembrane transporter activity?
Key genes include SLC30A10, HupE, ATP7A, ATP7B, and SLC8A1, among others [1,2,4,5,8].
How is metal ion transmembrane transporter activity regulated?
It is regulated by transcriptional, post-translational, and signaling mechanisms to maintain metal homeostasis [2,4,5].
What diseases are associated with metal ion transporters?
Diseases include Parkinsonism, hypertension, Wilson disease, and Menkes disease [2,4,5,8].
What methods are used to study metal ion transporters?
CRISPR knockout, point mutation, knock-in, overexpression, metal flux assays, and imaging are commonly used [2,4].
What is the role of SLC30A10 in manganese transport?
SLC30A10 is a manganese efflux transporter; mutations cause hypermanganesemia and Parkinsonism [2,4].
How can CRISPR be used to study metal ion transporters?
CRISPR can create knockout, point mutation, and knock-in models to dissect transporter function [2,4].
What is the significance of metal ion transport in bacteria?
Bacterial transporters like HupE are important for nickel uptake and virulence.
What are the synonyms for metal ion transmembrane transporter activity?
Synonyms include heavy metal-exporting ATPase activity and heavy metal ion porter activity.
How does EDITGENE support metal ion transporter research?
EDITGENE provides CRISPR services including knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics.
Conclusion
Metal ion transmembrane transporter activity (GO:0046873) is a fundamental molecular function that maintains cellular metal homeostasis and is implicated in various diseases [2,4,5]. Understanding its mechanisms through CRISPR-based models and biochemical assays can reveal therapeutic targets [2,4]. EDITGENE offers comprehensive services to accelerate research in this field.
References
- 1. Rowińska-Żyrek M. 2018. Metal interactions with the transmembrane region of HupE Ni(2+) transporter explain its efficiency.. J Inorg Biochem 180:33-38 PMID: 29227924
- 2. Zogzas CE et al.. 2016. Structural Elements in the Transmembrane and Cytoplasmic Domains of the Metal Transporter SLC30A10 Are Required for Its Manganese Efflux Activity.. J Biol Chem 291(31):15940-57 PMID: 27307044
- 3. Oka Y. 1996. [Glucose transporter].. Nihon Rinsho 54(3):632-7 PMID: 8904216
- 4. Zogzas CE et al.. 2018. Putative metal binding site in the transmembrane domain of the manganese transporter SLC30A10 is different from that of related zinc transporters.. Metallomics 10(8):1053-1064 PMID: 29989630
- 5. Doohan MM et al.. 1993. Myocardial cation transport.. J Hypertens 11(7):683-91 PMID: 8228185
- 6. Reusch RN. 2000. Transmembrane ion transport by polyphosphate/poly-(R)-3-hydroxybutyrate complexes.. Biochemistry (Mosc) 65(3):280-95 PMID: 10739470
- 7. Wright EM et al.. 1994. 'Active' sugar transport in eukaryotes.. J Exp Biol 196:197-212 PMID: 7823022
- 8. Guerini D et al.. 2005. Exporting calcium from cells.. Cell Calcium 38(3-4):281-9 PMID: 16102821
